Releasing mechanism for boring-tools



. and useful Improvement lar tapering un rrEn STATES PATENT orrron,

wI'LHELM-. s cHLrEn, or COLOGNE, GERMANY.

BELEA SING MECHANISM FOR BORING-TOOLS To all whom it may concern:

Be it known that I, VVILIIELM Sonlire g, a subject of the Emperor ofGermany, residing at Gabelsbergerstrasse 23, Oologneon-the-Rhine,Germany,- have invented a new in Releasing Mechanism for Boring-Tools,of which the following is a specification. v This invention relates toan improvement implements inserted in boring spindles. These tools wereformerly provided with t'angs of anguform adapted to engage in a likeshaped recess in the spindle itself. This construction has been found toinvolve rapid wear and soon to become unserviceable. In

order to remedy the drawbacks of this construction, it has been proposedto fit an axially adjustable cap so as to engage over the fiat sidedtang of the tool, but such a capas hitherto used causes difiieulty whenit is desired to release the tool from the spindle.

The present invention consists in providing a means for instantaneouslyreleasing the tang of the boring tool from the spindle and comprises arevoluble cam shaft-journaled in the bore spindle transversely to thespindle axis, and camson said snar't adapted to press down the cap whenthe cam shaft is rotated and thereby push the tool out of the borespindle.

The invention is illustrated in the accompanying drawing in Figures 1and 2 in iongitudinal section taken at right angles, the one to theother. The opening 6 formed in the bore spindle a serves to receive thecam shaft 0, d and the cap f. The cap engages with its recess f over thequadrangular tang h of the tool Z) making an absolutely secureconnection therewith even if the end of the. toolhas becomeshortened inconsequence of long use. I

Specification of Letters Patent. Application filed. December 17, 1909.Serial No. 533,660.

Patented Sept 3. 1912.

In order to prevent the camshaft from moving out transversely from thebore spindle, it is provided with an annular groove 9 in which a pin apassing through the bore spindle, can engage. Parts 05 between the cams0' of the cam shaft 0 d engage corresponding extensions on the cap f sothat this also is held from moving transversely. The two heads of thecam shaft 0 d possess quadrangular apertures for the engagement ofascrew key.

The action ofthe apparatus is as follows: When a screw key is insertedin one of the quadrangular holes and turned a little to the right orleft, the cam shaft -0 d presses down the cap 7, and the latter in turndepresses the tang h of the tool I), effecting the immediate release ofthe-tool from the bore spindle.

hat I claim is:

A device for releasing a boring tool from the spindle or holdercomprising in combina tion a transverse revoluble shaft, means forretaining said shaft from transverse movement in the spindle, atransverse cap axially guided in said spindle and recessed to engage thetang of the bore tool, collars on .said cap engaging with saidtransverse shaft to prevent transverse movement of the cap,

and cams on said transverseshaft engaging with said cap and adapted toforce it LX1-' ally outward when said cam shaft is rotated, for thepurpose of releasing the bore tool from the spindle.

In testimony .whereof I have signed my name to the specification twosubscribing witnesses.

WILHELM SCI-INTER.

Witnesses LOUIS Vzmponr, hurrunn .i iONA.

of the cam shaft 0 d in the presence of

